Question 1

The method used to find the best fitting line through the observations is called the ____________________ method.

Accepted Answer

The answer of The method used to find the best...

Question 2

The coefficient of variation is a measure of variability.

Accepted Answer

A) True 
 B)False

Question 3

Expressed in percentiles,the interquartile range is the difference between the 25th and 75th percentiles.

Accepted Answer

A) True 
 B)False

Question 4

Ages of Retirees ​ A sociologist recently conducted a survey of retirees over 65 years of age whose net worth is too high to qualify for Medicaid and who have no private health insurance.The ages of 20 uninsured retirees were as follows: 65,66,67,68,69,70,71,73,74,75,78,79,80,81,86,87,91,92,94,and 97. ​ ​
-{Ages of Retirees Narrative} Calculate the third quartile of the ages of the uninsured retirees.

Accepted Answer

Location = 15.75 and

Question 5

Suppose your data set contains ages (in years)and you calculate the range,variance,standard deviation,and coefficient of variation for the data.Explain what units each of these measures is in.

Accepted Answer

Range subtracts two years (largest minus

Question 6

Salaries of Employees ​ The following data represent the yearly salaries (in thousands of dollars)of a sample of 13 employees of a firm: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. ​ ​
-{Salaries of Employees Narrative} Compare the mean salary with the median salary and use them to describe the shape of the distribution.

Accepted Answer

The mean is $24,692 thousand dollars,and

Question 7

Graphical and numerical techniques,such as histograms and least squares lines provide identical information.

Accepted Answer

A) True 
 B)False

Question 8

Ages of Workers The ages (in years)of three groups of workers are shown below:   ​ ​
-{Ages of Workers Narrative} Compute and compare the ranges for the three groups.

Accepted Answer

Range = 6,15,and 33 (years)for Groups A,

Question 9

Weights of Workers ​
 The following data represent the number of employees of a sample of 25 companies: 164,148,137, 157,173,156,177,172,169,165,145,168,163,162,174,152,156,168,154,151,174,146,134, 140,and 171. ​ ​
-{Weights of Workers Narrative} Construct a stem and leaf display for the number of workers.

Accepted Answer

The answer of Weights of Workers ​
 The following data...

Question 10

The price-earnings ratios of a sample of stocks have a mean value of 13.5 and a standard deviation of 2.If the ratios have a bell shaped distribution,what can we say about the proportion of ratios that fall between 
a.11.5 and 15.5?
b.9.5 and 17.5?
c.7.5 and 19.5?

Accepted Answer

a. The interval contains approximately 6

Question 11

The number of hours a college student spent studying during the final exam week was recorded as follows:
7,6,4,9,8,5,and 10.Compute   for the data and the value in an appropriate unit.

Accepted Answer

The answer of The number of hours a college student...

Question 12

The number of hours a college student spent studying during the final exam week was recorded as follows: 7,6,4,9,8,5,and 10.Compute s2 and s for the data and express the numbers in the appropriate unit.

Accepted Answer

s² = 4.667

Question 13

If the mean,median,and mode are all equal,the histogram must be symmetric and bell shaped.

Accepted Answer

A) True 
 B)False

Question 14

The units for the variance are the same as the units for the original data (for example,feet,inches,etc.).

Accepted Answer

A) True 
 B)False

Question 15

The advantage that the coefficient of correlation has over the covariance is that the former has a set lower and upper limit.

Accepted Answer

A) True 
 B)False

The method used to find the best fitting line through the observations is called the ____________________ method.

The coefficient of variation is a measure of variability.

Expressed in percentiles,the interquartile range is the difference between the 25th and 75th percentiles.

Suppose your data set contains ages (in years)and you calculate the range,variance,standard deviation,and coefficient of variation for the data.Explain what units each of these measures is in.

Graphical and numerical techniques,such as histograms and least squares lines provide identical information.

Ages of Workers The ages (in years)of three groups of workers are shown below: -{Ages of Workers Narrative} Compute and compare the ranges for the three groups.

Weights of Workers The following data represent the number of employees of a sample of 25 companies: 164,148,137, 157,173,156,177,172,169,165,145,168,163,162,174,152,156,168,154,151,174,146,134, 140,and 171. -{Weights of Workers Narrative} Construct a stem and leaf display for the number of workers.

The price-earnings ratios of a sample of stocks have a mean value of 13.5 and a standard deviation of 2.If the ratios have a bell shaped distribution,what can we say about the proportion of ratios that fall between a.11.5 and 15.5? b.9.5 and 17.5? c.7.5 and 19.5?

The number of hours a college student spent studying during the final exam week was recorded as follows: 7,6,4,9,8,5,and 10.Compute for the data and the value in an appropriate unit.

The number of hours a college student spent studying during the final exam week was recorded as follows: 7,6,4,9,8,5,and 10.Compute s² and s for the data and express the numbers in the appropriate unit.

If the mean,median,and mode are all equal,the histogram must be symmetric and bell shaped.

The units for the variance are the same as the units for the original data (for example,feet,inches,etc.).

The advantage that the coefficient of correlation has over the covariance is that the former has a set lower and upper limit.

What Is Statistics

Graphical Descriptive Techniques 1

Graphical Descriptive Techniques 2

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analytics and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

Exam 4: Numerical Descriptive Techniques

The method used to find the best fitting line through the observations is called the ____________________ method.

The coefficient of variation is a measure of variability.

Expressed in percentiles,the interquartile range is the difference between the 25th and 75th percentiles.

Suppose your data set contains ages (in years)and you calculate the range,variance,standard deviation,and coefficient of variation for the data.Explain what units each of these measures is in.

Graphical and numerical techniques,such as histograms and least squares lines provide identical information.

Ages of Workers The ages (in years)of three groups of workers are shown below: ​ ​ -{Ages of Workers Narrative} Compute and compare the ranges for the three groups.

The price-earnings ratios of a sample of stocks have a mean value of 13.5 and a standard deviation of 2.If the ratios have a bell shaped distribution,what can we say about the proportion of ratios that fall between a.11.5 and 15.5? b.9.5 and 17.5? c.7.5 and 19.5?

The number of hours a college student spent studying during the final exam week was recorded as follows: 7,6,4,9,8,5,and 10.Compute for the data and the value in an appropriate unit.

The number of hours a college student spent studying during the final exam week was recorded as follows: 7,6,4,9,8,5,and 10.Compute s2 and s for the data and express the numbers in the appropriate unit.

If the mean,median,and mode are all equal,the histogram must be symmetric and bell shaped.

The units for the variance are the same as the units for the original data (for example,feet,inches,etc.).

The advantage that the coefficient of correlation has over the covariance is that the former has a set lower and upper limit.

What Is Statistics

Graphical Descriptive Techniques 1

Graphical Descriptive Techniques 2

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analytics and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

Ages of Workers The ages (in years)of three groups of workers are shown below: -{Ages of Workers Narrative} Compute and compare the ranges for the three groups.

The number of hours a college student spent studying during the final exam week was recorded as follows: 7,6,4,9,8,5,and 10.Compute s² and s for the data and express the numbers in the appropriate unit.